I have one Gran left. I see her once a week usually. She doesn't keep too well, sadly, so I'm trying to see her as often as possible.
Dad's dad died relatively young in his 60s when I was about 11. I grew up two doors down from him and my Granny so we were very close.
His wife died 6 months ago. She struggled with my Grandad dying and her own health started deteriorating about a year ago. Despite this, she died quite suddenly. Remarkably, her mum and my Great Granny is well into her 90s and in great shape.
Mum's dad died at the end of 2017. He was in his 80s but was in really good shape for his age. He only became unwell about a week before he died so that one shocked me the most.
I was close to all my grandparents and saw them all regularly so losing 2 in 6 months was a sore one. That being said, I always thought I was really lucky to be in my 20s with 3 grandparents still alive.